Monolithic-pipe mold.



F. w. KELLER.

MONOLITHIC PIPE MOLD. APPLICATION HLED FEB. 2! 1913. 1,146,263. Patented July 13, 1915.

2 SHEETS-SHEET 1.

WITNESSES: m l/VVE/VTOR wxm'zaw Amok/m F. w. KELLER.

MONOLITHIC PIPE MOLD.

APPLICATION FILED FEB- 21,1913- 1,146,263 v Patented July 13, 19.15.

2 SHEETSSHEET 2- to be a full, clear,

' UNITED STATES PATENT R'AN w. KELLER, or names, crrY, ii ssou u.

' MONOLITHIC-PIPE MOLD. l

To all whom it may concern} A 7 Be .it known that'I, FRANK W. KELLER,

a citizen of the United, States, residing at Kansas City, in the county of J acksonand,

State of Missouri, have invented certain new and useful Improvements in Monolithicdo declare the following" and exact description of Pipe Molds; and I the invention, such as will enable others skilled in the art to which it appertains to make and use the same,-reference being had to the accompanying drawings, and to, the letters and .figures. of reference marked thereon, which form apart of 'this spec1fication.

My invention relates tohmonolithic pipe molds, andymore particularly to an apparatus of that type for making pipe in the trenches wherein sewer, water, or like pipe is usually laid; the principal object of -the invention being to provide asection'al mold,

which maybeassembled as the work progresses, and which may be adjusted to form pipe of different diameters.

It is also an obyect ofmy invention to provide a. mold of this type wherein the separate sections may not only be assembled upon each other to form a continuous mold of the desired diameter,.but in which each,

section may be made to taper, to provide for specified enlargements or contractions, and in which thesections may be assembled at an angle to provide for curves or turns.

The apparatus consists, generically, of a plurality of independent, expansible mold:

sections, which are made to overlap, and are expanded circumferentially to form an inblocks upon which the sections are supported and to which said sections are tied to prevent floating when the tegral unit, base plastic mass is poured about the mold; and.

- a top shaper for determining the shape of the upper portion: of the pipe, the. preferred form of structure of such parts being illustrated in the accompanying drawings,

Figure I is an end view of a mold constructed according to my lnventlon, show-,

fing its position in a trench, ready for the pouring of the concrete. Fig. 11 is aside elevation of the same, parts being broken awayfor better illustration. Fig.1II is a perspectiveview ofthe top shaper. Fig. IV is a perspective'view of the mold core supporting and anchoring block. Fig. V is a perspective view of the mold core in ex- Specification of Letters 'latent. lst- 113 Application filed February 21, 1913. seriai No. 749,996.

panded position. Fig. V1 is an end view of twO core sections, showingfone of the cores OFFICE.

' locked in open'position, and thefother section' collapsed andsupported on the rails of' 1 the 'inclosi'ng' section.

' spective view of the joint between two core perspective vi'ewof anattachment for form-Q;

or enlargements Fig, isa' plan vi'ewfof two sections of the core, showing" the method 1 of laying a curved conduit'l Fig. XI'is a" ing manholes, branches, etc." Fig.

end view a modified form of core.

Referring more in details to the: part designates the mold core section's, whichare' preferably formed of sheet steel, and of such weight that they maybe easily ban;

dled by two men, each section'being curved so that it niay be shaped into a lcylinde'rhaving overlapped'edgesfl, Near theed e of each, core section are apertures 3 whic are adapted .for receiving tie wires 4to h'old' 't'he' f piece in cylindrical rormwhen its ed'ges, are overlapped,. and which arearraiigedQ sets. so that theidiamet'er ofthe core jyh varied. m I

Rigidly ime to thejihner 'raeitr ai form, opposite the overlapping edges 2, 1' p are parallel angle bars 5. which stiffen; the

core

. metal and provide rails over which other sections may travel when. the mold isljtakefi down (as presently described) and which terminate short of the ends of the cores to provide "space .6 for receiving adjacent sec tions. at are d'la ne pa s n r g at the other, each rail having apertures 5' in its ends for receiving the end'of a hook by preferably comprises a channel: member formed into a circle, the outside diameter of Iwhichthe core may be removed. The ring? which is slightly less than the inside'diameterof the pipe,' .and theends, of which are spaced apart,and provided with blocks 8 for receiving the right and left handed; 1 05 screw 9,; whereby the ring is expanded or contracted,

to rest on concrete blockslO, eachf of which. I

4 has a base portion ll, ofsuflicient width to provide a substanti'alfoundation or support, and a vertical seat portion 12, the uppersurface ofwhich is curved to the radius of the The joints of the core sections are its pipe. Embedded in the seat portion at each lock is a wire 13, the free ends of which are extended u around. the core form and twisted to 'hol her about which it is also twisted. I

The shaping member comprises curved plates 16 which are secnredto the under sides of the end rails 14 and are spaced to leave. a lon 'tudinal center opening 17 through whic the material may be-poured,

it projected beyond-the rails 14: to overlap like {projections on adjacent shapers. Pivotally mounted on theend rails 14 are standards 20, which are adapted to rest on the core torm, and space the top shaper from the form a distance equal to the desired thick- -ness of the pipe, and for folding upwardly- @Zoeen poured, in order that the material may vout of such space when the material has fset solidly around the core.

- In using the forms, a trench, having sub stantially'the outside'dimensions of the pipe to c s for conduit, is dug, and the concrete blo 9 set in fposition as shown in Figs. 1 and 11. A-core or and-opened to the proper diameter and tiedv m is then positioned on the blocks by wires d,which are passed through the proper sets of apertures 3 and twisted tohold the core to the desired diameter.

its

When a first core section is in place a secend section 1s placed in positlon and its forward end tied to hold it to the given' diameter, the other end being compressed and projected into the end of the first section. An expanding ring 7 is then applied 'to'the untied, contained end of the second section and the screw operated to expand. the ring and press the loose shell out against I the first section, to hold the parts firmly together and form a relatively integral structure. Succeeding sections are then similarly-placed, a workman usually following inside or the core to guide the new. sections and clamp the rings in position.

As soon as the new. section is placed, the wires 13 are twisted tightly over the joints to hold the core to'the anchor blocks and prevent the cores. from floating whenthe concrete is poured, and the top shaping members 15 are set in position with the "standards 20 restingon the core forms, and

the free ends of the wires twisted over the end rails 14' to complete the mold. Concrete is then poured through opening17 to fill the cavity formed by the walls of the ditch, the core forms and the top plates, and while the concrete is yet in a fluid state the standards 20 are turned, asshown in dotted the telescoping sections to the anchor block, the wires being of sufi cient length, however, to extend above the; curved end rails 1490f a top shaping mem have provide lines (Fig. 111)., so names tame they would otherwise leave may be 'lled,'-;it';fbeing apparent that the concrete blocks lowill be surrounded on the sides by the fresh con-f crete and form an integ al structure therewith.

. When the concrete has set', an mgnd the core forms, removes th and cuts the wires. 4 so that the forins'will collapse, as shown. in Fig. V1, and can be; reset by drawing them along the other core sections till-1M1" they drop from the railstv in the front'sections, and are supported on'the' extended portion ofsaid-front sections to form extensions of the mold.

In order tomake enlargements or reduce the size of the pipe, the core forms.may be secured at one end by a wired, as shown in Fig. IX, and joined to adjacentsections in the ordinary manner.

Fig. 'X showsa method of arranging the forms around curves, which has been found to be very practical, and is practised by turning each section a little farther out of the longitudinal axis of the pipe and expanding the ring 7 to conform to the slight variation in diameter. 1n ,using the mold for making concrete sewers or; cQnduits, manholes and branches are. necessaw, and in order to form them of concreteor provide a footing "for manholes constr gted of brick, or concrete 1 "the 'form shown in Fig. X1,

which com a pair of curved plates having-be y portionsQt adapted to seat over the main cores, and having end portions'25' adapted to overlap to complete a stub, theoverlapping portions being provided with apertures 3 and adapted for connection by line wires 4, as in the main core sections. It is apparent that with this construction the plates 23 may be set for any desired diameter, and may be held rigid by-placing an expanding-ring 7 therein.

l the manhole is to be also constructed'of concrete, one of the sections 1 may be placed upright and expanded in the cylindrical p1ece2t to form an upright core, it being apparent that the outer part of the mold ma be constructed in any suitable manner. though 1 have described the forms as cylindrical in shape 1 do not wish to be limited to this particular shape, as the elli tical form shown in Fig. X11 is very e cient' in some cases and is believed to lie end at an adjacent member and having.

lapped longitudinal edges, means tying the lapped edges at the outer end or each core,

.and an expansion ring located within the lapped edges at untied endof the contained core and pressmembers, each having one end loeated in the end of an adJacent member and having lapped longitudinal edges, means tying the the outer end of each core, an expansion rin located within the untied end of the contained core and pressing the same against the tied end of the containing Copies of this patent my be obtained for five cents each, by addressing the core, base hloeks supporting the cores at the telescoping joints and tie members embeddedin the base biock' and inclosing the jointed portions of the cores.

In testimon whereof I aflix my signature in presence 0 two witnesses.

FRANK w KELLER;

Witnesses: v

LEWIS L. MILLER, Lem E. CoA'rs.

Commissioner of Patents,

Washington, D. 0. 

